The Lua script allows you to to read certain parts of memory, and draw data onto the game screen. In order to use it, you need an emulator that supports lua scripts.
Here is a link to a snes9x version that works.
As well, here is the original Lua script that is useable.
Alternatively, here is a slightly modified one that only handles the atb system, and displays numbers.
Reminder that using the lua script is not race legal.